Elliptic flow of electrons from heavy-flavour hadron decays at mid-rapidity in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76 $ TeV

J Adam , Łukasz Graczykowski , Monika Jakubowska , Małgorzata Janik , Adam Kisiel , Janusz Oleniacz , Jan Pluta , Adam Szczepankiewicz , Maciej Szymański , Anna Zaborowska , Hanna Zbroszczyk , Jeremi Niedziela , Krzysztof Sielewicz

Abstract

The elliptic flow of electrons from heavy-flavour hadron decays at mid-rapidity (|y| < 0.7) is measured in Pb–Pb collisions at √ sNN = 2.76 TeV with ALICE at the LHC. The particle azimuthal distribution with respect to the reaction plane can be parametrized with a Fourier expansion, where the second coefficient (v2) represents the elliptic flow. The v2 coefficient of inclusive electrons is measured in three centrality classes (0–10%, 10–20% and 20–40%) with the event plane and the scalar product methods in the transverse momentum (pT) intervals 0.5–13 GeV/c and 0.5–8 GeV/c, respectively. After subtracting the background, mainly from photon conversions and Dalitz decays of neutral mesons, a positive v2 of electrons from heavy-flavour hadron decays is observed in all centrality classes, with a maximum significance of 5.9σ in the interval 2 < pT < 2.5 GeV/c in semicentral collisions (20–40%). The value of v2 decreases towards more central collisions at low and intermediate pT (0.5 < pT < 3 GeV/c). The v2 of electrons from heavy-flavour hadron decays at mid-rapidity is found to be similar to the one of muons from heavy-flavour hadron decays at forward rapidity (2.5 < y < 4). The results are described within uncertainties by model calculations including substantial elastic interactions of heavy quarks with an expanding strongly-interacting medium.
Collective authorALICE Collaboration
Author J Adam
J Adam,,
-
, Łukasz Graczykowski ZFJ
Łukasz Graczykowski,,
- Nuclear Physics Division
, Monika Jakubowska ISEP
Monika Jakubowska,,
- The Institute of Control and Industrial Electronics
, Małgorzata Janik ZFJ
Małgorzata Janik,,
- Nuclear Physics Division
, Adam Kisiel ZFJ
Adam Kisiel,,
- Nuclear Physics Division
, Janusz Oleniacz ZFJ
Janusz Oleniacz,,
- Nuclear Physics Division
, Jan Pluta ZFJ
Jan Pluta,,
- Nuclear Physics Division
, Adam Szczepankiewicz II - European Organization for Nuclear Research Geneva Switzerland (CERN )
Adam Szczepankiewicz,,
- The Institute of Computer Science
, Maciej Szymański ZFJ
Maciej Szymański,,
- Nuclear Physics Division
, Anna Zaborowska ZFJ
Anna Zaborowska,,
- Nuclear Physics Division
et al.`
Total number of authors997
Journal seriesJournal of High Energy Physics, ISSN 1029-8479 [1126-6708]
Issue year2016
Vol09
No028
Pages1-41
Publication size in sheets2
Keywords in EnglishHeavy Ion Experiments
DOIDOI:10.1007/JHEP09(2016)028
URL http://link.springer.com/article/10.1007%2FJHEP09%282016%29028
Languageen angielski
LicenseJournal (articles only); author's original; Uznanie Autorstwa (CC-BY); after publication
File
art_10.1007_JHEP09(2016)028.pdf 2.7 MB
Score (nominal)40
ScoreMinisterial score = 40.0, 28-11-2017, ArticleFromJournal
Ministerial score (2013-2016) = 40.0, 28-11-2017, ArticleFromJournal
Publication indicators WoS Impact Factor: 2016 = 6.063 (2) - 2016=4.992 (5)
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